沉积盆地断裂趋势带形成演化及其控藏作用

发布时间：2018-06-20 18:49

本文选题：断裂趋势带 + 基底断裂　；参考：《地球科学》2017年04期

【摘要】：断裂趋势带是指盆地沉积盖层内的弱变形构造带,属于断裂带形成演化早期或中期阶段的产物.沉积盆地断裂趋势带隐蔽性较强,识别标志不明显,往往被忽视,因而在断裂趋势带上未发现油气藏的区域应该是未来油气勘探值得重视的领域.根据断裂趋势带的规模可将其划分为:(1)圈闭级断裂趋势带,特征是多个雁列式断块、弧形断块或者复合型断块圈闭呈线状排列组成;(2)洼陷级断裂趋势带,表现为雁列式展布的多条断裂或褶皱,其间由小断层断续相连;(3)凹陷级断裂趋势带,表现为洼陷、凸起、沉积相带或圈闭等构造单元呈线状断续相间排列;(4)坳陷级断裂趋势带,属于区域性隐性断裂,一般表现为沿固定方向基底埋深突变、沉积盖层厚度突变、沉积相带突变等特征;(5)盆地级断裂趋势带,表现为成排成带的低幅度构造定向延伸组合成的大规模鼻状褶皱带或大型低幅度隆起.另外,结合构造物理模拟实验建立了基底断裂走滑型断裂趋势带的5阶段演化模式分析认为,断裂趋势带油气聚集模式可以概括为6种:雁列状断块聚集模式、带状断块聚集模式、雁列状褶皱聚集模式、平行状复合圈闭聚集模式、网格状复合圈闭聚集模式、环状复合圈闭聚集模式.
[Abstract]:The fault trend zone refers to the weak deformation structural belt in the sedimentary cover of the basin, which is the product of the early or mid stage of the fracture zone. The fault trend zone of the sedimentary basin is more concealed, and the identification marks are not obvious and often ignored. Therefore, the area of oil and gas exploration in the fault trend zone should be worth paying attention to in the future oil and gas exploration. According to the scale of the fracture trend zone, it can be divided into: (1) the trap grade fracture trend zone, characterized by multiple echelon fault block, arc fault block or compound fault block trap with linear arrangement; (2) the depression trend zone is characterized by multiple breakages or folds of the wild goose row, which is intermittently connected by small faults, and (3) depression grade fault. The crack trend zone, characterized by depression, protruding, sedimentary facies belt or trap, is linear and intermittent, and (4) depression trend zone, which belongs to regional recessive fault, is generally characterized by sudden change of buried depth along the fixed base, abrupt thickness of sedimentary cover and catastrophe of sedimentary facies belt, and (5) basin grade fault trend zone. In addition, the 5 stage evolution model of the basement fault strike slip fracture trend zone is established by combining the structural physical simulation experiments. It is concluded that the oil and gas accumulation mode of the fracture trend zone can be summarized into 6 kinds: the pattern of the wild goose row fault block aggregation. Strip block aggregation model, en echelon folds aggregation mode, parallel composite trap aggregation model, grid composite trap model, cyclic composite trap accumulation mode.
【作者单位】：中国石油大学地球科学与技术学院;中国科学院边缘海地质重点实验室;中国地质调查局油气资源调查中心;
【基金】：国家自然科学基金项目(No.41340008)
【分类号】：P618.13;P542

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